Long-Term Changes in Concentration and Yield of Riverine Dissolved Silicon From the Poles to the Tropics
Abstract Riverine exports of silicon (Si) influence global carbon cycling through the growth of marine diatoms, which account for ∼25% of global primary production. Climate change will likely alter river Si exports in biome-specific ways due to interacting shifts in chemical weathering rates, hydrol...
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American Geophysical Union
2023
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/652557 2024-02-11T09:58:39+01:00 Long-Term Changes in Concentration and Yield of Riverine Dissolved Silicon From the Poles to the Tropics Jankowski, Kathi Jo Johnson, Keira Sethna, Lienne Julian, Paul Wymore, Adam S. Shogren, Arial J. Thomas, Patrick K. Sullivan, Pamela L. McKnight, Diane M. McDowell, William H. Heindel, Ruth Jones, Jeremy B. Wollheim, Wilfred Abbott, Benjamin Deegan, Linda Carey, Joanna C. 2023-09 application/application/pdf https://hdl.handle.net/20.500.11850/652557 https://doi.org/10.3929/ethz-b-000652557 en eng American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2022GB007678 http://hdl.handle.net/20.500.11850/652557 doi:10.3929/ethz-b-000652557 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International Global Biogeochemical Cycles, 37 (9) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftethz https://doi.org/20.500.11850/65255710.3929/ethz-b-00065255710.1029/2022GB007678 2024-01-22T00:53:30Z Abstract Riverine exports of silicon (Si) influence global carbon cycling through the growth of marine diatoms, which account for ∼25% of global primary production. Climate change will likely alter river Si exports in biome-specific ways due to interacting shifts in chemical weathering rates, hydrologic connectivity, and metabolic processes in aquatic and terrestrial systems. Nonetheless, factors driving long-term changes in Si exports remain unexplored at local, regional, and global scales. We evaluated how concentrations and yields of dissolved Si (DSi) changed over the last several decades of rapid climate warming using long-term data sets from 60 rivers and streams spanning the globe (e.g., Antarctic, tropical, temperate, boreal, alpine, Arctic systems). We show that widespread changes in river DSi concentration and yield have occurred, with the most substantial shifts occurring in alpine and polar regions. The magnitude and direction of trends varied within and among biomes, were most strongly associated with differences in land cover, and were often independent of changes in river discharge. These findings indicate that there are likely diverse mechanisms driving change in river Si biogeochemistry that span the land-water interface, which may include glacial melt, changes in terrestrial vegetation, and river productivity. Finally, trends were often stronger in months outside of the growing season, particularly in temperate and boreal systems, demonstrating a potentially important role of shifting seasonality for the flux of Si from rivers. Our results have implications for the timing and magnitude of silica processing in rivers and its delivery to global oceans. ISSN:0886-6236 ISSN:1944-9224 Article in Journal/Newspaper Antarc* Antarctic Arctic Climate change ETH Zürich Research Collection Antarctic Arctic |
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Open Polar |
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ETH Zürich Research Collection |
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ftethz |
language |
English |
description |
Abstract Riverine exports of silicon (Si) influence global carbon cycling through the growth of marine diatoms, which account for ∼25% of global primary production. Climate change will likely alter river Si exports in biome-specific ways due to interacting shifts in chemical weathering rates, hydrologic connectivity, and metabolic processes in aquatic and terrestrial systems. Nonetheless, factors driving long-term changes in Si exports remain unexplored at local, regional, and global scales. We evaluated how concentrations and yields of dissolved Si (DSi) changed over the last several decades of rapid climate warming using long-term data sets from 60 rivers and streams spanning the globe (e.g., Antarctic, tropical, temperate, boreal, alpine, Arctic systems). We show that widespread changes in river DSi concentration and yield have occurred, with the most substantial shifts occurring in alpine and polar regions. The magnitude and direction of trends varied within and among biomes, were most strongly associated with differences in land cover, and were often independent of changes in river discharge. These findings indicate that there are likely diverse mechanisms driving change in river Si biogeochemistry that span the land-water interface, which may include glacial melt, changes in terrestrial vegetation, and river productivity. Finally, trends were often stronger in months outside of the growing season, particularly in temperate and boreal systems, demonstrating a potentially important role of shifting seasonality for the flux of Si from rivers. Our results have implications for the timing and magnitude of silica processing in rivers and its delivery to global oceans. ISSN:0886-6236 ISSN:1944-9224 |
format |
Article in Journal/Newspaper |
author |
Jankowski, Kathi Jo Johnson, Keira Sethna, Lienne Julian, Paul Wymore, Adam S. Shogren, Arial J. Thomas, Patrick K. Sullivan, Pamela L. McKnight, Diane M. McDowell, William H. Heindel, Ruth Jones, Jeremy B. Wollheim, Wilfred Abbott, Benjamin Deegan, Linda Carey, Joanna C. |
spellingShingle |
Jankowski, Kathi Jo Johnson, Keira Sethna, Lienne Julian, Paul Wymore, Adam S. Shogren, Arial J. Thomas, Patrick K. Sullivan, Pamela L. McKnight, Diane M. McDowell, William H. Heindel, Ruth Jones, Jeremy B. Wollheim, Wilfred Abbott, Benjamin Deegan, Linda Carey, Joanna C. Long-Term Changes in Concentration and Yield of Riverine Dissolved Silicon From the Poles to the Tropics |
author_facet |
Jankowski, Kathi Jo Johnson, Keira Sethna, Lienne Julian, Paul Wymore, Adam S. Shogren, Arial J. Thomas, Patrick K. Sullivan, Pamela L. McKnight, Diane M. McDowell, William H. Heindel, Ruth Jones, Jeremy B. Wollheim, Wilfred Abbott, Benjamin Deegan, Linda Carey, Joanna C. |
author_sort |
Jankowski, Kathi Jo |
title |
Long-Term Changes in Concentration and Yield of Riverine Dissolved Silicon From the Poles to the Tropics |
title_short |
Long-Term Changes in Concentration and Yield of Riverine Dissolved Silicon From the Poles to the Tropics |
title_full |
Long-Term Changes in Concentration and Yield of Riverine Dissolved Silicon From the Poles to the Tropics |
title_fullStr |
Long-Term Changes in Concentration and Yield of Riverine Dissolved Silicon From the Poles to the Tropics |
title_full_unstemmed |
Long-Term Changes in Concentration and Yield of Riverine Dissolved Silicon From the Poles to the Tropics |
title_sort |
long-term changes in concentration and yield of riverine dissolved silicon from the poles to the tropics |
publisher |
American Geophysical Union |
publishDate |
2023 |
url |
https://hdl.handle.net/20.500.11850/652557 https://doi.org/10.3929/ethz-b-000652557 |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Arctic Climate change |
genre_facet |
Antarc* Antarctic Arctic Climate change |
op_source |
Global Biogeochemical Cycles, 37 (9) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2022GB007678 http://hdl.handle.net/20.500.11850/652557 doi:10.3929/ethz-b-000652557 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/65255710.3929/ethz-b-00065255710.1029/2022GB007678 |
_version_ |
1790594361405210624 |